Module arrow::csv::writer [−][src]
Expand description
CSV Writer
This CSV writer allows Arrow data (in record batches) to be written as CSV files.
The writer does not support writing ListArray
and StructArray
.
Example:
use arrow::array::*;
use arrow::csv;
use arrow::datatypes::*;
use arrow::record_batch::RecordBatch;
use arrow::util::test_util::get_temp_file;
use std::fs::File;
use std::sync::Arc;
let schema = Schema::new(vec![
Field::new("c1", DataType::Utf8, false),
Field::new("c2", DataType::Float64, true),
Field::new("c3", DataType::UInt32, false),
Field::new("c3", DataType::Boolean, true),
]);
let c1 = StringArray::from(vec![
"Lorem ipsum dolor sit amet",
"consectetur adipiscing elit",
"sed do eiusmod tempor",
]);
let c2 = PrimitiveArray::<Float64Type>::from(vec![
Some(123.564532),
None,
Some(-556132.25),
]);
let c3 = PrimitiveArray::<UInt32Type>::from(vec![3, 2, 1]);
let c4 = BooleanArray::from(vec![Some(true), Some(false), None]);
let batch = RecordBatch::try_new(
Arc::new(schema),
vec![Arc::new(c1), Arc::new(c2), Arc::new(c3), Arc::new(c4)],
)
.unwrap();
let file = get_temp_file("out.csv", &[]);
let mut writer = csv::Writer::new(file);
let batches = vec![&batch, &batch];
for batch in batches {
writer.write(batch).unwrap();
}
Structs
A CSV writer
A CSV writer builder